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8
9#define pr_fmt(fmt) KBUILD_BASENAME ": " fmt
10
11#include <linux/init.h>
12#include <linux/types.h>
13#include <linux/idr.h>
14#include <linux/input/mt.h>
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <linux/random.h>
18#include <linux/major.h>
19#include <linux/proc_fs.h>
20#include <linux/sched.h>
21#include <linux/seq_file.h>
22#include <linux/poll.h>
23#include <linux/device.h>
24#include <linux/mutex.h>
25#include <linux/rcupdate.h>
26#include "input-compat.h"
27#include "input-poller.h"
28
29MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
30MODULE_DESCRIPTION("Input core");
31MODULE_LICENSE("GPL");
32
33#define INPUT_MAX_CHAR_DEVICES 1024
34#define INPUT_FIRST_DYNAMIC_DEV 256
35static DEFINE_IDA(input_ida);
36
37static LIST_HEAD(input_dev_list);
38static LIST_HEAD(input_handler_list);
39
40
41
42
43
44
45
46static DEFINE_MUTEX(input_mutex);
47
48static const struct input_value input_value_sync = { EV_SYN, SYN_REPORT, 1 };
49
50static inline int is_event_supported(unsigned int code,
51 unsigned long *bm, unsigned int max)
52{
53 return code <= max && test_bit(code, bm);
54}
55
56static int input_defuzz_abs_event(int value, int old_val, int fuzz)
57{
58 if (fuzz) {
59 if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
60 return old_val;
61
62 if (value > old_val - fuzz && value < old_val + fuzz)
63 return (old_val * 3 + value) / 4;
64
65 if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
66 return (old_val + value) / 2;
67 }
68
69 return value;
70}
71
72static void input_start_autorepeat(struct input_dev *dev, int code)
73{
74 if (test_bit(EV_REP, dev->evbit) &&
75 dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
76 dev->timer.function) {
77 dev->repeat_key = code;
78 mod_timer(&dev->timer,
79 jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
80 }
81}
82
83static void input_stop_autorepeat(struct input_dev *dev)
84{
85 del_timer(&dev->timer);
86}
87
88
89
90
91
92
93static unsigned int input_to_handler(struct input_handle *handle,
94 struct input_value *vals, unsigned int count)
95{
96 struct input_handler *handler = handle->handler;
97 struct input_value *end = vals;
98 struct input_value *v;
99
100 if (handler->filter) {
101 for (v = vals; v != vals + count; v++) {
102 if (handler->filter(handle, v->type, v->code, v->value))
103 continue;
104 if (end != v)
105 *end = *v;
106 end++;
107 }
108 count = end - vals;
109 }
110
111 if (!count)
112 return 0;
113
114 if (handler->events)
115 handler->events(handle, vals, count);
116 else if (handler->event)
117 for (v = vals; v != vals + count; v++)
118 handler->event(handle, v->type, v->code, v->value);
119
120 return count;
121}
122
123
124
125
126
127
128static void input_pass_values(struct input_dev *dev,
129 struct input_value *vals, unsigned int count)
130{
131 struct input_handle *handle;
132 struct input_value *v;
133
134 if (!count)
135 return;
136
137 rcu_read_lock();
138
139 handle = rcu_dereference(dev->grab);
140 if (handle) {
141 count = input_to_handler(handle, vals, count);
142 } else {
143 list_for_each_entry_rcu(handle, &dev->h_list, d_node)
144 if (handle->open) {
145 count = input_to_handler(handle, vals, count);
146 if (!count)
147 break;
148 }
149 }
150
151 rcu_read_unlock();
152
153
154 if (test_bit(EV_REP, dev->evbit) && test_bit(EV_KEY, dev->evbit)) {
155 for (v = vals; v != vals + count; v++) {
156 if (v->type == EV_KEY && v->value != 2) {
157 if (v->value)
158 input_start_autorepeat(dev, v->code);
159 else
160 input_stop_autorepeat(dev);
161 }
162 }
163 }
164}
165
166static void input_pass_event(struct input_dev *dev,
167 unsigned int type, unsigned int code, int value)
168{
169 struct input_value vals[] = { { type, code, value } };
170
171 input_pass_values(dev, vals, ARRAY_SIZE(vals));
172}
173
174
175
176
177
178
179static void input_repeat_key(struct timer_list *t)
180{
181 struct input_dev *dev = from_timer(dev, t, timer);
182 unsigned long flags;
183
184 spin_lock_irqsave(&dev->event_lock, flags);
185
186 if (test_bit(dev->repeat_key, dev->key) &&
187 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
188 struct input_value vals[] = {
189 { EV_KEY, dev->repeat_key, 2 },
190 input_value_sync
191 };
192
193 input_set_timestamp(dev, ktime_get());
194 input_pass_values(dev, vals, ARRAY_SIZE(vals));
195
196 if (dev->rep[REP_PERIOD])
197 mod_timer(&dev->timer, jiffies +
198 msecs_to_jiffies(dev->rep[REP_PERIOD]));
199 }
200
201 spin_unlock_irqrestore(&dev->event_lock, flags);
202}
203
204#define INPUT_IGNORE_EVENT 0
205#define INPUT_PASS_TO_HANDLERS 1
206#define INPUT_PASS_TO_DEVICE 2
207#define INPUT_SLOT 4
208#define INPUT_FLUSH 8
209#define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
210
211static int input_handle_abs_event(struct input_dev *dev,
212 unsigned int code, int *pval)
213{
214 struct input_mt *mt = dev->mt;
215 bool is_mt_event;
216 int *pold;
217
218 if (code == ABS_MT_SLOT) {
219
220
221
222
223 if (mt && *pval >= 0 && *pval < mt->num_slots)
224 mt->slot = *pval;
225
226 return INPUT_IGNORE_EVENT;
227 }
228
229 is_mt_event = input_is_mt_value(code);
230
231 if (!is_mt_event) {
232 pold = &dev->absinfo[code].value;
233 } else if (mt) {
234 pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST];
235 } else {
236
237
238
239
240 pold = NULL;
241 }
242
243 if (pold) {
244 *pval = input_defuzz_abs_event(*pval, *pold,
245 dev->absinfo[code].fuzz);
246 if (*pold == *pval)
247 return INPUT_IGNORE_EVENT;
248
249 *pold = *pval;
250 }
251
252
253 if (is_mt_event && mt && mt->slot != input_abs_get_val(dev, ABS_MT_SLOT)) {
254 input_abs_set_val(dev, ABS_MT_SLOT, mt->slot);
255 return INPUT_PASS_TO_HANDLERS | INPUT_SLOT;
256 }
257
258 return INPUT_PASS_TO_HANDLERS;
259}
260
261static int input_get_disposition(struct input_dev *dev,
262 unsigned int type, unsigned int code, int *pval)
263{
264 int disposition = INPUT_IGNORE_EVENT;
265 int value = *pval;
266
267 switch (type) {
268
269 case EV_SYN:
270 switch (code) {
271 case SYN_CONFIG:
272 disposition = INPUT_PASS_TO_ALL;
273 break;
274
275 case SYN_REPORT:
276 disposition = INPUT_PASS_TO_HANDLERS | INPUT_FLUSH;
277 break;
278 case SYN_MT_REPORT:
279 disposition = INPUT_PASS_TO_HANDLERS;
280 break;
281 }
282 break;
283
284 case EV_KEY:
285 if (is_event_supported(code, dev->keybit, KEY_MAX)) {
286
287
288 if (value == 2) {
289 disposition = INPUT_PASS_TO_HANDLERS;
290 break;
291 }
292
293 if (!!test_bit(code, dev->key) != !!value) {
294
295 __change_bit(code, dev->key);
296 disposition = INPUT_PASS_TO_HANDLERS;
297 }
298 }
299 break;
300
301 case EV_SW:
302 if (is_event_supported(code, dev->swbit, SW_MAX) &&
303 !!test_bit(code, dev->sw) != !!value) {
304
305 __change_bit(code, dev->sw);
306 disposition = INPUT_PASS_TO_HANDLERS;
307 }
308 break;
309
310 case EV_ABS:
311 if (is_event_supported(code, dev->absbit, ABS_MAX))
312 disposition = input_handle_abs_event(dev, code, &value);
313
314 break;
315
316 case EV_REL:
317 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
318 disposition = INPUT_PASS_TO_HANDLERS;
319
320 break;
321
322 case EV_MSC:
323 if (is_event_supported(code, dev->mscbit, MSC_MAX))
324 disposition = INPUT_PASS_TO_ALL;
325
326 break;
327
328 case EV_LED:
329 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
330 !!test_bit(code, dev->led) != !!value) {
331
332 __change_bit(code, dev->led);
333 disposition = INPUT_PASS_TO_ALL;
334 }
335 break;
336
337 case EV_SND:
338 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
339
340 if (!!test_bit(code, dev->snd) != !!value)
341 __change_bit(code, dev->snd);
342 disposition = INPUT_PASS_TO_ALL;
343 }
344 break;
345
346 case EV_REP:
347 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
348 dev->rep[code] = value;
349 disposition = INPUT_PASS_TO_ALL;
350 }
351 break;
352
353 case EV_FF:
354 if (value >= 0)
355 disposition = INPUT_PASS_TO_ALL;
356 break;
357
358 case EV_PWR:
359 disposition = INPUT_PASS_TO_ALL;
360 break;
361 }
362
363 *pval = value;
364 return disposition;
365}
366
367static void input_handle_event(struct input_dev *dev,
368 unsigned int type, unsigned int code, int value)
369{
370 int disposition = input_get_disposition(dev, type, code, &value);
371
372 if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
373 add_input_randomness(type, code, value);
374
375 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
376 dev->event(dev, type, code, value);
377
378 if (!dev->vals)
379 return;
380
381 if (disposition & INPUT_PASS_TO_HANDLERS) {
382 struct input_value *v;
383
384 if (disposition & INPUT_SLOT) {
385 v = &dev->vals[dev->num_vals++];
386 v->type = EV_ABS;
387 v->code = ABS_MT_SLOT;
388 v->value = dev->mt->slot;
389 }
390
391 v = &dev->vals[dev->num_vals++];
392 v->type = type;
393 v->code = code;
394 v->value = value;
395 }
396
397 if (disposition & INPUT_FLUSH) {
398 if (dev->num_vals >= 2)
399 input_pass_values(dev, dev->vals, dev->num_vals);
400 dev->num_vals = 0;
401
402
403
404
405
406
407 dev->timestamp[INPUT_CLK_MONO] = ktime_set(0, 0);
408 } else if (dev->num_vals >= dev->max_vals - 2) {
409 dev->vals[dev->num_vals++] = input_value_sync;
410 input_pass_values(dev, dev->vals, dev->num_vals);
411 dev->num_vals = 0;
412 }
413
414}
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433void input_event(struct input_dev *dev,
434 unsigned int type, unsigned int code, int value)
435{
436 unsigned long flags;
437
438 if (is_event_supported(type, dev->evbit, EV_MAX)) {
439
440 spin_lock_irqsave(&dev->event_lock, flags);
441 input_handle_event(dev, type, code, value);
442 spin_unlock_irqrestore(&dev->event_lock, flags);
443 }
444}
445EXPORT_SYMBOL(input_event);
446
447
448
449
450
451
452
453
454
455
456
457
458void input_inject_event(struct input_handle *handle,
459 unsigned int type, unsigned int code, int value)
460{
461 struct input_dev *dev = handle->dev;
462 struct input_handle *grab;
463 unsigned long flags;
464
465 if (is_event_supported(type, dev->evbit, EV_MAX)) {
466 spin_lock_irqsave(&dev->event_lock, flags);
467
468 rcu_read_lock();
469 grab = rcu_dereference(dev->grab);
470 if (!grab || grab == handle)
471 input_handle_event(dev, type, code, value);
472 rcu_read_unlock();
473
474 spin_unlock_irqrestore(&dev->event_lock, flags);
475 }
476}
477EXPORT_SYMBOL(input_inject_event);
478
479
480
481
482
483
484
485
486void input_alloc_absinfo(struct input_dev *dev)
487{
488 if (dev->absinfo)
489 return;
490
491 dev->absinfo = kcalloc(ABS_CNT, sizeof(*dev->absinfo), GFP_KERNEL);
492 if (!dev->absinfo) {
493 dev_err(dev->dev.parent ?: &dev->dev,
494 "%s: unable to allocate memory\n", __func__);
495
496
497
498
499
500 }
501}
502EXPORT_SYMBOL(input_alloc_absinfo);
503
504void input_set_abs_params(struct input_dev *dev, unsigned int axis,
505 int min, int max, int fuzz, int flat)
506{
507 struct input_absinfo *absinfo;
508
509 input_alloc_absinfo(dev);
510 if (!dev->absinfo)
511 return;
512
513 absinfo = &dev->absinfo[axis];
514 absinfo->minimum = min;
515 absinfo->maximum = max;
516 absinfo->fuzz = fuzz;
517 absinfo->flat = flat;
518
519 __set_bit(EV_ABS, dev->evbit);
520 __set_bit(axis, dev->absbit);
521}
522EXPORT_SYMBOL(input_set_abs_params);
523
524
525
526
527
528
529
530
531
532
533int input_grab_device(struct input_handle *handle)
534{
535 struct input_dev *dev = handle->dev;
536 int retval;
537
538 retval = mutex_lock_interruptible(&dev->mutex);
539 if (retval)
540 return retval;
541
542 if (dev->grab) {
543 retval = -EBUSY;
544 goto out;
545 }
546
547 rcu_assign_pointer(dev->grab, handle);
548
549 out:
550 mutex_unlock(&dev->mutex);
551 return retval;
552}
553EXPORT_SYMBOL(input_grab_device);
554
555static void __input_release_device(struct input_handle *handle)
556{
557 struct input_dev *dev = handle->dev;
558 struct input_handle *grabber;
559
560 grabber = rcu_dereference_protected(dev->grab,
561 lockdep_is_held(&dev->mutex));
562 if (grabber == handle) {
563 rcu_assign_pointer(dev->grab, NULL);
564
565 synchronize_rcu();
566
567 list_for_each_entry(handle, &dev->h_list, d_node)
568 if (handle->open && handle->handler->start)
569 handle->handler->start(handle);
570 }
571}
572
573
574
575
576
577
578
579
580
581
582void input_release_device(struct input_handle *handle)
583{
584 struct input_dev *dev = handle->dev;
585
586 mutex_lock(&dev->mutex);
587 __input_release_device(handle);
588 mutex_unlock(&dev->mutex);
589}
590EXPORT_SYMBOL(input_release_device);
591
592
593
594
595
596
597
598
599int input_open_device(struct input_handle *handle)
600{
601 struct input_dev *dev = handle->dev;
602 int retval;
603
604 retval = mutex_lock_interruptible(&dev->mutex);
605 if (retval)
606 return retval;
607
608 if (dev->going_away) {
609 retval = -ENODEV;
610 goto out;
611 }
612
613 handle->open++;
614
615 if (dev->users++) {
616
617
618
619
620 goto out;
621 }
622
623 if (dev->open) {
624 retval = dev->open(dev);
625 if (retval) {
626 dev->users--;
627 handle->open--;
628
629
630
631
632 synchronize_rcu();
633 goto out;
634 }
635 }
636
637 if (dev->poller)
638 input_dev_poller_start(dev->poller);
639
640 out:
641 mutex_unlock(&dev->mutex);
642 return retval;
643}
644EXPORT_SYMBOL(input_open_device);
645
646int input_flush_device(struct input_handle *handle, struct file *file)
647{
648 struct input_dev *dev = handle->dev;
649 int retval;
650
651 retval = mutex_lock_interruptible(&dev->mutex);
652 if (retval)
653 return retval;
654
655 if (dev->flush)
656 retval = dev->flush(dev, file);
657
658 mutex_unlock(&dev->mutex);
659 return retval;
660}
661EXPORT_SYMBOL(input_flush_device);
662
663
664
665
666
667
668
669
670void input_close_device(struct input_handle *handle)
671{
672 struct input_dev *dev = handle->dev;
673
674 mutex_lock(&dev->mutex);
675
676 __input_release_device(handle);
677
678 if (!--dev->users) {
679 if (dev->poller)
680 input_dev_poller_stop(dev->poller);
681
682 if (dev->close)
683 dev->close(dev);
684 }
685
686 if (!--handle->open) {
687
688
689
690
691
692 synchronize_rcu();
693 }
694
695 mutex_unlock(&dev->mutex);
696}
697EXPORT_SYMBOL(input_close_device);
698
699
700
701
702
703static void input_dev_release_keys(struct input_dev *dev)
704{
705 bool need_sync = false;
706 int code;
707
708 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
709 for_each_set_bit(code, dev->key, KEY_CNT) {
710 input_pass_event(dev, EV_KEY, code, 0);
711 need_sync = true;
712 }
713
714 if (need_sync)
715 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
716
717 memset(dev->key, 0, sizeof(dev->key));
718 }
719}
720
721
722
723
724static void input_disconnect_device(struct input_dev *dev)
725{
726 struct input_handle *handle;
727
728
729
730
731
732
733 mutex_lock(&dev->mutex);
734 dev->going_away = true;
735 mutex_unlock(&dev->mutex);
736
737 spin_lock_irq(&dev->event_lock);
738
739
740
741
742
743
744
745 input_dev_release_keys(dev);
746
747 list_for_each_entry(handle, &dev->h_list, d_node)
748 handle->open = 0;
749
750 spin_unlock_irq(&dev->event_lock);
751}
752
753
754
755
756
757
758
759
760
761
762
763int input_scancode_to_scalar(const struct input_keymap_entry *ke,
764 unsigned int *scancode)
765{
766 switch (ke->len) {
767 case 1:
768 *scancode = *((u8 *)ke->scancode);
769 break;
770
771 case 2:
772 *scancode = *((u16 *)ke->scancode);
773 break;
774
775 case 4:
776 *scancode = *((u32 *)ke->scancode);
777 break;
778
779 default:
780 return -EINVAL;
781 }
782
783 return 0;
784}
785EXPORT_SYMBOL(input_scancode_to_scalar);
786
787
788
789
790
791
792static unsigned int input_fetch_keycode(struct input_dev *dev,
793 unsigned int index)
794{
795 switch (dev->keycodesize) {
796 case 1:
797 return ((u8 *)dev->keycode)[index];
798
799 case 2:
800 return ((u16 *)dev->keycode)[index];
801
802 default:
803 return ((u32 *)dev->keycode)[index];
804 }
805}
806
807static int input_default_getkeycode(struct input_dev *dev,
808 struct input_keymap_entry *ke)
809{
810 unsigned int index;
811 int error;
812
813 if (!dev->keycodesize)
814 return -EINVAL;
815
816 if (ke->flags & INPUT_KEYMAP_BY_INDEX)
817 index = ke->index;
818 else {
819 error = input_scancode_to_scalar(ke, &index);
820 if (error)
821 return error;
822 }
823
824 if (index >= dev->keycodemax)
825 return -EINVAL;
826
827 ke->keycode = input_fetch_keycode(dev, index);
828 ke->index = index;
829 ke->len = sizeof(index);
830 memcpy(ke->scancode, &index, sizeof(index));
831
832 return 0;
833}
834
835static int input_default_setkeycode(struct input_dev *dev,
836 const struct input_keymap_entry *ke,
837 unsigned int *old_keycode)
838{
839 unsigned int index;
840 int error;
841 int i;
842
843 if (!dev->keycodesize)
844 return -EINVAL;
845
846 if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
847 index = ke->index;
848 } else {
849 error = input_scancode_to_scalar(ke, &index);
850 if (error)
851 return error;
852 }
853
854 if (index >= dev->keycodemax)
855 return -EINVAL;
856
857 if (dev->keycodesize < sizeof(ke->keycode) &&
858 (ke->keycode >> (dev->keycodesize * 8)))
859 return -EINVAL;
860
861 switch (dev->keycodesize) {
862 case 1: {
863 u8 *k = (u8 *)dev->keycode;
864 *old_keycode = k[index];
865 k[index] = ke->keycode;
866 break;
867 }
868 case 2: {
869 u16 *k = (u16 *)dev->keycode;
870 *old_keycode = k[index];
871 k[index] = ke->keycode;
872 break;
873 }
874 default: {
875 u32 *k = (u32 *)dev->keycode;
876 *old_keycode = k[index];
877 k[index] = ke->keycode;
878 break;
879 }
880 }
881
882 if (*old_keycode <= KEY_MAX) {
883 __clear_bit(*old_keycode, dev->keybit);
884 for (i = 0; i < dev->keycodemax; i++) {
885 if (input_fetch_keycode(dev, i) == *old_keycode) {
886 __set_bit(*old_keycode, dev->keybit);
887
888 break;
889 }
890 }
891 }
892
893 __set_bit(ke->keycode, dev->keybit);
894 return 0;
895}
896
897
898
899
900
901
902
903
904
905int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke)
906{
907 unsigned long flags;
908 int retval;
909
910 spin_lock_irqsave(&dev->event_lock, flags);
911 retval = dev->getkeycode(dev, ke);
912 spin_unlock_irqrestore(&dev->event_lock, flags);
913
914 return retval;
915}
916EXPORT_SYMBOL(input_get_keycode);
917
918
919
920
921
922
923
924
925
926int input_set_keycode(struct input_dev *dev,
927 const struct input_keymap_entry *ke)
928{
929 unsigned long flags;
930 unsigned int old_keycode;
931 int retval;
932
933 if (ke->keycode > KEY_MAX)
934 return -EINVAL;
935
936 spin_lock_irqsave(&dev->event_lock, flags);
937
938 retval = dev->setkeycode(dev, ke, &old_keycode);
939 if (retval)
940 goto out;
941
942
943 __clear_bit(KEY_RESERVED, dev->keybit);
944
945
946
947
948
949 if (old_keycode > KEY_MAX) {
950 dev_warn(dev->dev.parent ?: &dev->dev,
951 "%s: got too big old keycode %#x\n",
952 __func__, old_keycode);
953 } else if (test_bit(EV_KEY, dev->evbit) &&
954 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
955 __test_and_clear_bit(old_keycode, dev->key)) {
956 struct input_value vals[] = {
957 { EV_KEY, old_keycode, 0 },
958 input_value_sync
959 };
960
961 input_pass_values(dev, vals, ARRAY_SIZE(vals));
962 }
963
964 out:
965 spin_unlock_irqrestore(&dev->event_lock, flags);
966
967 return retval;
968}
969EXPORT_SYMBOL(input_set_keycode);
970
971bool input_match_device_id(const struct input_dev *dev,
972 const struct input_device_id *id)
973{
974 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
975 if (id->bustype != dev->id.bustype)
976 return false;
977
978 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
979 if (id->vendor != dev->id.vendor)
980 return false;
981
982 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
983 if (id->product != dev->id.product)
984 return false;
985
986 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
987 if (id->version != dev->id.version)
988 return false;
989
990 if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX) ||
991 !bitmap_subset(id->keybit, dev->keybit, KEY_MAX) ||
992 !bitmap_subset(id->relbit, dev->relbit, REL_MAX) ||
993 !bitmap_subset(id->absbit, dev->absbit, ABS_MAX) ||
994 !bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX) ||
995 !bitmap_subset(id->ledbit, dev->ledbit, LED_MAX) ||
996 !bitmap_subset(id->sndbit, dev->sndbit, SND_MAX) ||
997 !bitmap_subset(id->ffbit, dev->ffbit, FF_MAX) ||
998 !bitmap_subset(id->swbit, dev->swbit, SW_MAX) ||
999 !bitmap_subset(id->propbit, dev->propbit, INPUT_PROP_MAX)) {
1000 return false;
1001 }
1002
1003 return true;
1004}
1005EXPORT_SYMBOL(input_match_device_id);
1006
1007static const struct input_device_id *input_match_device(struct input_handler *handler,
1008 struct input_dev *dev)
1009{
1010 const struct input_device_id *id;
1011
1012 for (id = handler->id_table; id->flags || id->driver_info; id++) {
1013 if (input_match_device_id(dev, id) &&
1014 (!handler->match || handler->match(handler, dev))) {
1015 return id;
1016 }
1017 }
1018
1019 return NULL;
1020}
1021
1022static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
1023{
1024 const struct input_device_id *id;
1025 int error;
1026
1027 id = input_match_device(handler, dev);
1028 if (!id)
1029 return -ENODEV;
1030
1031 error = handler->connect(handler, dev, id);
1032 if (error && error != -ENODEV)
1033 pr_err("failed to attach handler %s to device %s, error: %d\n",
1034 handler->name, kobject_name(&dev->dev.kobj), error);
1035
1036 return error;
1037}
1038
1039#ifdef CONFIG_COMPAT
1040
1041static int input_bits_to_string(char *buf, int buf_size,
1042 unsigned long bits, bool skip_empty)
1043{
1044 int len = 0;
1045
1046 if (in_compat_syscall()) {
1047 u32 dword = bits >> 32;
1048 if (dword || !skip_empty)
1049 len += snprintf(buf, buf_size, "%x ", dword);
1050
1051 dword = bits & 0xffffffffUL;
1052 if (dword || !skip_empty || len)
1053 len += snprintf(buf + len, max(buf_size - len, 0),
1054 "%x", dword);
1055 } else {
1056 if (bits || !skip_empty)
1057 len += snprintf(buf, buf_size, "%lx", bits);
1058 }
1059
1060 return len;
1061}
1062
1063#else
1064
1065static int input_bits_to_string(char *buf, int buf_size,
1066 unsigned long bits, bool skip_empty)
1067{
1068 return bits || !skip_empty ?
1069 snprintf(buf, buf_size, "%lx", bits) : 0;
1070}
1071
1072#endif
1073
1074#ifdef CONFIG_PROC_FS
1075
1076static struct proc_dir_entry *proc_bus_input_dir;
1077static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
1078static int input_devices_state;
1079
1080static inline void input_wakeup_procfs_readers(void)
1081{
1082 input_devices_state++;
1083 wake_up(&input_devices_poll_wait);
1084}
1085
1086static __poll_t input_proc_devices_poll(struct file *file, poll_table *wait)
1087{
1088 poll_wait(file, &input_devices_poll_wait, wait);
1089 if (file->f_version != input_devices_state) {
1090 file->f_version = input_devices_state;
1091 return EPOLLIN | EPOLLRDNORM;
1092 }
1093
1094 return 0;
1095}
1096
1097union input_seq_state {
1098 struct {
1099 unsigned short pos;
1100 bool mutex_acquired;
1101 };
1102 void *p;
1103};
1104
1105static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
1106{
1107 union input_seq_state *state = (union input_seq_state *)&seq->private;
1108 int error;
1109
1110
1111 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1112
1113 error = mutex_lock_interruptible(&input_mutex);
1114 if (error) {
1115 state->mutex_acquired = false;
1116 return ERR_PTR(error);
1117 }
1118
1119 state->mutex_acquired = true;
1120
1121 return seq_list_start(&input_dev_list, *pos);
1122}
1123
1124static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1125{
1126 return seq_list_next(v, &input_dev_list, pos);
1127}
1128
1129static void input_seq_stop(struct seq_file *seq, void *v)
1130{
1131 union input_seq_state *state = (union input_seq_state *)&seq->private;
1132
1133 if (state->mutex_acquired)
1134 mutex_unlock(&input_mutex);
1135}
1136
1137static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
1138 unsigned long *bitmap, int max)
1139{
1140 int i;
1141 bool skip_empty = true;
1142 char buf[18];
1143
1144 seq_printf(seq, "B: %s=", name);
1145
1146 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1147 if (input_bits_to_string(buf, sizeof(buf),
1148 bitmap[i], skip_empty)) {
1149 skip_empty = false;
1150 seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
1151 }
1152 }
1153
1154
1155
1156
1157 if (skip_empty)
1158 seq_putc(seq, '0');
1159
1160 seq_putc(seq, '\n');
1161}
1162
1163static int input_devices_seq_show(struct seq_file *seq, void *v)
1164{
1165 struct input_dev *dev = container_of(v, struct input_dev, node);
1166 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1167 struct input_handle *handle;
1168
1169 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
1170 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
1171
1172 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
1173 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
1174 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
1175 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
1176 seq_puts(seq, "H: Handlers=");
1177
1178 list_for_each_entry(handle, &dev->h_list, d_node)
1179 seq_printf(seq, "%s ", handle->name);
1180 seq_putc(seq, '\n');
1181
1182 input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX);
1183
1184 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
1185 if (test_bit(EV_KEY, dev->evbit))
1186 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
1187 if (test_bit(EV_REL, dev->evbit))
1188 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
1189 if (test_bit(EV_ABS, dev->evbit))
1190 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
1191 if (test_bit(EV_MSC, dev->evbit))
1192 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
1193 if (test_bit(EV_LED, dev->evbit))
1194 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
1195 if (test_bit(EV_SND, dev->evbit))
1196 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
1197 if (test_bit(EV_FF, dev->evbit))
1198 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
1199 if (test_bit(EV_SW, dev->evbit))
1200 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
1201
1202 seq_putc(seq, '\n');
1203
1204 kfree(path);
1205 return 0;
1206}
1207
1208static const struct seq_operations input_devices_seq_ops = {
1209 .start = input_devices_seq_start,
1210 .next = input_devices_seq_next,
1211 .stop = input_seq_stop,
1212 .show = input_devices_seq_show,
1213};
1214
1215static int input_proc_devices_open(struct inode *inode, struct file *file)
1216{
1217 return seq_open(file, &input_devices_seq_ops);
1218}
1219
1220static const struct proc_ops input_devices_proc_ops = {
1221 .proc_open = input_proc_devices_open,
1222 .proc_poll = input_proc_devices_poll,
1223 .proc_read = seq_read,
1224 .proc_lseek = seq_lseek,
1225 .proc_release = seq_release,
1226};
1227
1228static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
1229{
1230 union input_seq_state *state = (union input_seq_state *)&seq->private;
1231 int error;
1232
1233
1234 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1235
1236 error = mutex_lock_interruptible(&input_mutex);
1237 if (error) {
1238 state->mutex_acquired = false;
1239 return ERR_PTR(error);
1240 }
1241
1242 state->mutex_acquired = true;
1243 state->pos = *pos;
1244
1245 return seq_list_start(&input_handler_list, *pos);
1246}
1247
1248static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1249{
1250 union input_seq_state *state = (union input_seq_state *)&seq->private;
1251
1252 state->pos = *pos + 1;
1253 return seq_list_next(v, &input_handler_list, pos);
1254}
1255
1256static int input_handlers_seq_show(struct seq_file *seq, void *v)
1257{
1258 struct input_handler *handler = container_of(v, struct input_handler, node);
1259 union input_seq_state *state = (union input_seq_state *)&seq->private;
1260
1261 seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
1262 if (handler->filter)
1263 seq_puts(seq, " (filter)");
1264 if (handler->legacy_minors)
1265 seq_printf(seq, " Minor=%d", handler->minor);
1266 seq_putc(seq, '\n');
1267
1268 return 0;
1269}
1270
1271static const struct seq_operations input_handlers_seq_ops = {
1272 .start = input_handlers_seq_start,
1273 .next = input_handlers_seq_next,
1274 .stop = input_seq_stop,
1275 .show = input_handlers_seq_show,
1276};
1277
1278static int input_proc_handlers_open(struct inode *inode, struct file *file)
1279{
1280 return seq_open(file, &input_handlers_seq_ops);
1281}
1282
1283static const struct proc_ops input_handlers_proc_ops = {
1284 .proc_open = input_proc_handlers_open,
1285 .proc_read = seq_read,
1286 .proc_lseek = seq_lseek,
1287 .proc_release = seq_release,
1288};
1289
1290static int __init input_proc_init(void)
1291{
1292 struct proc_dir_entry *entry;
1293
1294 proc_bus_input_dir = proc_mkdir("bus/input", NULL);
1295 if (!proc_bus_input_dir)
1296 return -ENOMEM;
1297
1298 entry = proc_create("devices", 0, proc_bus_input_dir,
1299 &input_devices_proc_ops);
1300 if (!entry)
1301 goto fail1;
1302
1303 entry = proc_create("handlers", 0, proc_bus_input_dir,
1304 &input_handlers_proc_ops);
1305 if (!entry)
1306 goto fail2;
1307
1308 return 0;
1309
1310 fail2: remove_proc_entry("devices", proc_bus_input_dir);
1311 fail1: remove_proc_entry("bus/input", NULL);
1312 return -ENOMEM;
1313}
1314
1315static void input_proc_exit(void)
1316{
1317 remove_proc_entry("devices", proc_bus_input_dir);
1318 remove_proc_entry("handlers", proc_bus_input_dir);
1319 remove_proc_entry("bus/input", NULL);
1320}
1321
1322#else
1323static inline void input_wakeup_procfs_readers(void) { }
1324static inline int input_proc_init(void) { return 0; }
1325static inline void input_proc_exit(void) { }
1326#endif
1327
1328#define INPUT_DEV_STRING_ATTR_SHOW(name) \
1329static ssize_t input_dev_show_##name(struct device *dev, \
1330 struct device_attribute *attr, \
1331 char *buf) \
1332{ \
1333 struct input_dev *input_dev = to_input_dev(dev); \
1334 \
1335 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1336 input_dev->name ? input_dev->name : ""); \
1337} \
1338static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
1339
1340INPUT_DEV_STRING_ATTR_SHOW(name);
1341INPUT_DEV_STRING_ATTR_SHOW(phys);
1342INPUT_DEV_STRING_ATTR_SHOW(uniq);
1343
1344static int input_print_modalias_bits(char *buf, int size,
1345 char name, unsigned long *bm,
1346 unsigned int min_bit, unsigned int max_bit)
1347{
1348 int len = 0, i;
1349
1350 len += snprintf(buf, max(size, 0), "%c", name);
1351 for (i = min_bit; i < max_bit; i++)
1352 if (bm[BIT_WORD(i)] & BIT_MASK(i))
1353 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
1354 return len;
1355}
1356
1357static int input_print_modalias(char *buf, int size, struct input_dev *id,
1358 int add_cr)
1359{
1360 int len;
1361
1362 len = snprintf(buf, max(size, 0),
1363 "input:b%04Xv%04Xp%04Xe%04X-",
1364 id->id.bustype, id->id.vendor,
1365 id->id.product, id->id.version);
1366
1367 len += input_print_modalias_bits(buf + len, size - len,
1368 'e', id->evbit, 0, EV_MAX);
1369 len += input_print_modalias_bits(buf + len, size - len,
1370 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
1371 len += input_print_modalias_bits(buf + len, size - len,
1372 'r', id->relbit, 0, REL_MAX);
1373 len += input_print_modalias_bits(buf + len, size - len,
1374 'a', id->absbit, 0, ABS_MAX);
1375 len += input_print_modalias_bits(buf + len, size - len,
1376 'm', id->mscbit, 0, MSC_MAX);
1377 len += input_print_modalias_bits(buf + len, size - len,
1378 'l', id->ledbit, 0, LED_MAX);
1379 len += input_print_modalias_bits(buf + len, size - len,
1380 's', id->sndbit, 0, SND_MAX);
1381 len += input_print_modalias_bits(buf + len, size - len,
1382 'f', id->ffbit, 0, FF_MAX);
1383 len += input_print_modalias_bits(buf + len, size - len,
1384 'w', id->swbit, 0, SW_MAX);
1385
1386 if (add_cr)
1387 len += snprintf(buf + len, max(size - len, 0), "\n");
1388
1389 return len;
1390}
1391
1392static ssize_t input_dev_show_modalias(struct device *dev,
1393 struct device_attribute *attr,
1394 char *buf)
1395{
1396 struct input_dev *id = to_input_dev(dev);
1397 ssize_t len;
1398
1399 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1400
1401 return min_t(int, len, PAGE_SIZE);
1402}
1403static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
1404
1405static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1406 int max, int add_cr);
1407
1408static ssize_t input_dev_show_properties(struct device *dev,
1409 struct device_attribute *attr,
1410 char *buf)
1411{
1412 struct input_dev *input_dev = to_input_dev(dev);
1413 int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit,
1414 INPUT_PROP_MAX, true);
1415 return min_t(int, len, PAGE_SIZE);
1416}
1417static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL);
1418
1419static struct attribute *input_dev_attrs[] = {
1420 &dev_attr_name.attr,
1421 &dev_attr_phys.attr,
1422 &dev_attr_uniq.attr,
1423 &dev_attr_modalias.attr,
1424 &dev_attr_properties.attr,
1425 NULL
1426};
1427
1428static const struct attribute_group input_dev_attr_group = {
1429 .attrs = input_dev_attrs,
1430};
1431
1432#define INPUT_DEV_ID_ATTR(name) \
1433static ssize_t input_dev_show_id_##name(struct device *dev, \
1434 struct device_attribute *attr, \
1435 char *buf) \
1436{ \
1437 struct input_dev *input_dev = to_input_dev(dev); \
1438 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1439} \
1440static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
1441
1442INPUT_DEV_ID_ATTR(bustype);
1443INPUT_DEV_ID_ATTR(vendor);
1444INPUT_DEV_ID_ATTR(product);
1445INPUT_DEV_ID_ATTR(version);
1446
1447static struct attribute *input_dev_id_attrs[] = {
1448 &dev_attr_bustype.attr,
1449 &dev_attr_vendor.attr,
1450 &dev_attr_product.attr,
1451 &dev_attr_version.attr,
1452 NULL
1453};
1454
1455static const struct attribute_group input_dev_id_attr_group = {
1456 .name = "id",
1457 .attrs = input_dev_id_attrs,
1458};
1459
1460static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1461 int max, int add_cr)
1462{
1463 int i;
1464 int len = 0;
1465 bool skip_empty = true;
1466
1467 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1468 len += input_bits_to_string(buf + len, max(buf_size - len, 0),
1469 bitmap[i], skip_empty);
1470 if (len) {
1471 skip_empty = false;
1472 if (i > 0)
1473 len += snprintf(buf + len, max(buf_size - len, 0), " ");
1474 }
1475 }
1476
1477
1478
1479
1480 if (len == 0)
1481 len = snprintf(buf, buf_size, "%d", 0);
1482
1483 if (add_cr)
1484 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1485
1486 return len;
1487}
1488
1489#define INPUT_DEV_CAP_ATTR(ev, bm) \
1490static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1491 struct device_attribute *attr, \
1492 char *buf) \
1493{ \
1494 struct input_dev *input_dev = to_input_dev(dev); \
1495 int len = input_print_bitmap(buf, PAGE_SIZE, \
1496 input_dev->bm##bit, ev##_MAX, \
1497 true); \
1498 return min_t(int, len, PAGE_SIZE); \
1499} \
1500static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
1501
1502INPUT_DEV_CAP_ATTR(EV, ev);
1503INPUT_DEV_CAP_ATTR(KEY, key);
1504INPUT_DEV_CAP_ATTR(REL, rel);
1505INPUT_DEV_CAP_ATTR(ABS, abs);
1506INPUT_DEV_CAP_ATTR(MSC, msc);
1507INPUT_DEV_CAP_ATTR(LED, led);
1508INPUT_DEV_CAP_ATTR(SND, snd);
1509INPUT_DEV_CAP_ATTR(FF, ff);
1510INPUT_DEV_CAP_ATTR(SW, sw);
1511
1512static struct attribute *input_dev_caps_attrs[] = {
1513 &dev_attr_ev.attr,
1514 &dev_attr_key.attr,
1515 &dev_attr_rel.attr,
1516 &dev_attr_abs.attr,
1517 &dev_attr_msc.attr,
1518 &dev_attr_led.attr,
1519 &dev_attr_snd.attr,
1520 &dev_attr_ff.attr,
1521 &dev_attr_sw.attr,
1522 NULL
1523};
1524
1525static const struct attribute_group input_dev_caps_attr_group = {
1526 .name = "capabilities",
1527 .attrs = input_dev_caps_attrs,
1528};
1529
1530static const struct attribute_group *input_dev_attr_groups[] = {
1531 &input_dev_attr_group,
1532 &input_dev_id_attr_group,
1533 &input_dev_caps_attr_group,
1534 &input_poller_attribute_group,
1535 NULL
1536};
1537
1538static void input_dev_release(struct device *device)
1539{
1540 struct input_dev *dev = to_input_dev(device);
1541
1542 input_ff_destroy(dev);
1543 input_mt_destroy_slots(dev);
1544 kfree(dev->poller);
1545 kfree(dev->absinfo);
1546 kfree(dev->vals);
1547 kfree(dev);
1548
1549 module_put(THIS_MODULE);
1550}
1551
1552
1553
1554
1555
1556static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
1557 const char *name, unsigned long *bitmap, int max)
1558{
1559 int len;
1560
1561 if (add_uevent_var(env, "%s", name))
1562 return -ENOMEM;
1563
1564 len = input_print_bitmap(&env->buf[env->buflen - 1],
1565 sizeof(env->buf) - env->buflen,
1566 bitmap, max, false);
1567 if (len >= (sizeof(env->buf) - env->buflen))
1568 return -ENOMEM;
1569
1570 env->buflen += len;
1571 return 0;
1572}
1573
1574static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
1575 struct input_dev *dev)
1576{
1577 int len;
1578
1579 if (add_uevent_var(env, "MODALIAS="))
1580 return -ENOMEM;
1581
1582 len = input_print_modalias(&env->buf[env->buflen - 1],
1583 sizeof(env->buf) - env->buflen,
1584 dev, 0);
1585 if (len >= (sizeof(env->buf) - env->buflen))
1586 return -ENOMEM;
1587
1588 env->buflen += len;
1589 return 0;
1590}
1591
1592#define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1593 do { \
1594 int err = add_uevent_var(env, fmt, val); \
1595 if (err) \
1596 return err; \
1597 } while (0)
1598
1599#define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1600 do { \
1601 int err = input_add_uevent_bm_var(env, name, bm, max); \
1602 if (err) \
1603 return err; \
1604 } while (0)
1605
1606#define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1607 do { \
1608 int err = input_add_uevent_modalias_var(env, dev); \
1609 if (err) \
1610 return err; \
1611 } while (0)
1612
1613static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
1614{
1615 struct input_dev *dev = to_input_dev(device);
1616
1617 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1618 dev->id.bustype, dev->id.vendor,
1619 dev->id.product, dev->id.version);
1620 if (dev->name)
1621 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1622 if (dev->phys)
1623 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
1624 if (dev->uniq)
1625 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1626
1627 INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX);
1628
1629 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1630 if (test_bit(EV_KEY, dev->evbit))
1631 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1632 if (test_bit(EV_REL, dev->evbit))
1633 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1634 if (test_bit(EV_ABS, dev->evbit))
1635 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1636 if (test_bit(EV_MSC, dev->evbit))
1637 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1638 if (test_bit(EV_LED, dev->evbit))
1639 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1640 if (test_bit(EV_SND, dev->evbit))
1641 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1642 if (test_bit(EV_FF, dev->evbit))
1643 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1644 if (test_bit(EV_SW, dev->evbit))
1645 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1646
1647 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
1648
1649 return 0;
1650}
1651
1652#define INPUT_DO_TOGGLE(dev, type, bits, on) \
1653 do { \
1654 int i; \
1655 bool active; \
1656 \
1657 if (!test_bit(EV_##type, dev->evbit)) \
1658 break; \
1659 \
1660 for_each_set_bit(i, dev->bits##bit, type##_CNT) { \
1661 active = test_bit(i, dev->bits); \
1662 if (!active && !on) \
1663 continue; \
1664 \
1665 dev->event(dev, EV_##type, i, on ? active : 0); \
1666 } \
1667 } while (0)
1668
1669static void input_dev_toggle(struct input_dev *dev, bool activate)
1670{
1671 if (!dev->event)
1672 return;
1673
1674 INPUT_DO_TOGGLE(dev, LED, led, activate);
1675 INPUT_DO_TOGGLE(dev, SND, snd, activate);
1676
1677 if (activate && test_bit(EV_REP, dev->evbit)) {
1678 dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
1679 dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
1680 }
1681}
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691void input_reset_device(struct input_dev *dev)
1692{
1693 unsigned long flags;
1694
1695 mutex_lock(&dev->mutex);
1696 spin_lock_irqsave(&dev->event_lock, flags);
1697
1698 input_dev_toggle(dev, true);
1699 input_dev_release_keys(dev);
1700
1701 spin_unlock_irqrestore(&dev->event_lock, flags);
1702 mutex_unlock(&dev->mutex);
1703}
1704EXPORT_SYMBOL(input_reset_device);
1705
1706#ifdef CONFIG_PM_SLEEP
1707static int input_dev_suspend(struct device *dev)
1708{
1709 struct input_dev *input_dev = to_input_dev(dev);
1710
1711 spin_lock_irq(&input_dev->event_lock);
1712
1713
1714
1715
1716
1717 input_dev_release_keys(input_dev);
1718
1719
1720 input_dev_toggle(input_dev, false);
1721
1722 spin_unlock_irq(&input_dev->event_lock);
1723
1724 return 0;
1725}
1726
1727static int input_dev_resume(struct device *dev)
1728{
1729 struct input_dev *input_dev = to_input_dev(dev);
1730
1731 spin_lock_irq(&input_dev->event_lock);
1732
1733
1734 input_dev_toggle(input_dev, true);
1735
1736 spin_unlock_irq(&input_dev->event_lock);
1737
1738 return 0;
1739}
1740
1741static int input_dev_freeze(struct device *dev)
1742{
1743 struct input_dev *input_dev = to_input_dev(dev);
1744
1745 spin_lock_irq(&input_dev->event_lock);
1746
1747
1748
1749
1750
1751 input_dev_release_keys(input_dev);
1752
1753 spin_unlock_irq(&input_dev->event_lock);
1754
1755 return 0;
1756}
1757
1758static int input_dev_poweroff(struct device *dev)
1759{
1760 struct input_dev *input_dev = to_input_dev(dev);
1761
1762 spin_lock_irq(&input_dev->event_lock);
1763
1764
1765 input_dev_toggle(input_dev, false);
1766
1767 spin_unlock_irq(&input_dev->event_lock);
1768
1769 return 0;
1770}
1771
1772static const struct dev_pm_ops input_dev_pm_ops = {
1773 .suspend = input_dev_suspend,
1774 .resume = input_dev_resume,
1775 .freeze = input_dev_freeze,
1776 .poweroff = input_dev_poweroff,
1777 .restore = input_dev_resume,
1778};
1779#endif
1780
1781static const struct device_type input_dev_type = {
1782 .groups = input_dev_attr_groups,
1783 .release = input_dev_release,
1784 .uevent = input_dev_uevent,
1785#ifdef CONFIG_PM_SLEEP
1786 .pm = &input_dev_pm_ops,
1787#endif
1788};
1789
1790static char *input_devnode(struct device *dev, umode_t *mode)
1791{
1792 return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
1793}
1794
1795struct class input_class = {
1796 .name = "input",
1797 .devnode = input_devnode,
1798};
1799EXPORT_SYMBOL_GPL(input_class);
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810struct input_dev *input_allocate_device(void)
1811{
1812 static atomic_t input_no = ATOMIC_INIT(-1);
1813 struct input_dev *dev;
1814
1815 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1816 if (dev) {
1817 dev->dev.type = &input_dev_type;
1818 dev->dev.class = &input_class;
1819 device_initialize(&dev->dev);
1820 mutex_init(&dev->mutex);
1821 spin_lock_init(&dev->event_lock);
1822 timer_setup(&dev->timer, NULL, 0);
1823 INIT_LIST_HEAD(&dev->h_list);
1824 INIT_LIST_HEAD(&dev->node);
1825
1826 dev_set_name(&dev->dev, "input%lu",
1827 (unsigned long)atomic_inc_return(&input_no));
1828
1829 __module_get(THIS_MODULE);
1830 }
1831
1832 return dev;
1833}
1834EXPORT_SYMBOL(input_allocate_device);
1835
1836struct input_devres {
1837 struct input_dev *input;
1838};
1839
1840static int devm_input_device_match(struct device *dev, void *res, void *data)
1841{
1842 struct input_devres *devres = res;
1843
1844 return devres->input == data;
1845}
1846
1847static void devm_input_device_release(struct device *dev, void *res)
1848{
1849 struct input_devres *devres = res;
1850 struct input_dev *input = devres->input;
1851
1852 dev_dbg(dev, "%s: dropping reference to %s\n",
1853 __func__, dev_name(&input->dev));
1854 input_put_device(input);
1855}
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875struct input_dev *devm_input_allocate_device(struct device *dev)
1876{
1877 struct input_dev *input;
1878 struct input_devres *devres;
1879
1880 devres = devres_alloc(devm_input_device_release,
1881 sizeof(*devres), GFP_KERNEL);
1882 if (!devres)
1883 return NULL;
1884
1885 input = input_allocate_device();
1886 if (!input) {
1887 devres_free(devres);
1888 return NULL;
1889 }
1890
1891 input->dev.parent = dev;
1892 input->devres_managed = true;
1893
1894 devres->input = input;
1895 devres_add(dev, devres);
1896
1897 return input;
1898}
1899EXPORT_SYMBOL(devm_input_allocate_device);
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915void input_free_device(struct input_dev *dev)
1916{
1917 if (dev) {
1918 if (dev->devres_managed)
1919 WARN_ON(devres_destroy(dev->dev.parent,
1920 devm_input_device_release,
1921 devm_input_device_match,
1922 dev));
1923 input_put_device(dev);
1924 }
1925}
1926EXPORT_SYMBOL(input_free_device);
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942void input_set_timestamp(struct input_dev *dev, ktime_t timestamp)
1943{
1944 dev->timestamp[INPUT_CLK_MONO] = timestamp;
1945 dev->timestamp[INPUT_CLK_REAL] = ktime_mono_to_real(timestamp);
1946 dev->timestamp[INPUT_CLK_BOOT] = ktime_mono_to_any(timestamp,
1947 TK_OFFS_BOOT);
1948}
1949EXPORT_SYMBOL(input_set_timestamp);
1950
1951
1952
1953
1954
1955
1956
1957ktime_t *input_get_timestamp(struct input_dev *dev)
1958{
1959 const ktime_t invalid_timestamp = ktime_set(0, 0);
1960
1961 if (!ktime_compare(dev->timestamp[INPUT_CLK_MONO], invalid_timestamp))
1962 input_set_timestamp(dev, ktime_get());
1963
1964 return dev->timestamp;
1965}
1966EXPORT_SYMBOL(input_get_timestamp);
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1978{
1979 switch (type) {
1980 case EV_KEY:
1981 __set_bit(code, dev->keybit);
1982 break;
1983
1984 case EV_REL:
1985 __set_bit(code, dev->relbit);
1986 break;
1987
1988 case EV_ABS:
1989 input_alloc_absinfo(dev);
1990 if (!dev->absinfo)
1991 return;
1992
1993 __set_bit(code, dev->absbit);
1994 break;
1995
1996 case EV_MSC:
1997 __set_bit(code, dev->mscbit);
1998 break;
1999
2000 case EV_SW:
2001 __set_bit(code, dev->swbit);
2002 break;
2003
2004 case EV_LED:
2005 __set_bit(code, dev->ledbit);
2006 break;
2007
2008 case EV_SND:
2009 __set_bit(code, dev->sndbit);
2010 break;
2011
2012 case EV_FF:
2013 __set_bit(code, dev->ffbit);
2014 break;
2015
2016 case EV_PWR:
2017
2018 break;
2019
2020 default:
2021 pr_err("%s: unknown type %u (code %u)\n", __func__, type, code);
2022 dump_stack();
2023 return;
2024 }
2025
2026 __set_bit(type, dev->evbit);
2027}
2028EXPORT_SYMBOL(input_set_capability);
2029
2030static unsigned int input_estimate_events_per_packet(struct input_dev *dev)
2031{
2032 int mt_slots;
2033 int i;
2034 unsigned int events;
2035
2036 if (dev->mt) {
2037 mt_slots = dev->mt->num_slots;
2038 } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) {
2039 mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum -
2040 dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1,
2041 mt_slots = clamp(mt_slots, 2, 32);
2042 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
2043 mt_slots = 2;
2044 } else {
2045 mt_slots = 0;
2046 }
2047
2048 events = mt_slots + 1;
2049
2050 if (test_bit(EV_ABS, dev->evbit))
2051 for_each_set_bit(i, dev->absbit, ABS_CNT)
2052 events += input_is_mt_axis(i) ? mt_slots : 1;
2053
2054 if (test_bit(EV_REL, dev->evbit))
2055 events += bitmap_weight(dev->relbit, REL_CNT);
2056
2057
2058 events += 7;
2059
2060 return events;
2061}
2062
2063#define INPUT_CLEANSE_BITMASK(dev, type, bits) \
2064 do { \
2065 if (!test_bit(EV_##type, dev->evbit)) \
2066 memset(dev->bits##bit, 0, \
2067 sizeof(dev->bits##bit)); \
2068 } while (0)
2069
2070static void input_cleanse_bitmasks(struct input_dev *dev)
2071{
2072 INPUT_CLEANSE_BITMASK(dev, KEY, key);
2073 INPUT_CLEANSE_BITMASK(dev, REL, rel);
2074 INPUT_CLEANSE_BITMASK(dev, ABS, abs);
2075 INPUT_CLEANSE_BITMASK(dev, MSC, msc);
2076 INPUT_CLEANSE_BITMASK(dev, LED, led);
2077 INPUT_CLEANSE_BITMASK(dev, SND, snd);
2078 INPUT_CLEANSE_BITMASK(dev, FF, ff);
2079 INPUT_CLEANSE_BITMASK(dev, SW, sw);
2080}
2081
2082static void __input_unregister_device(struct input_dev *dev)
2083{
2084 struct input_handle *handle, *next;
2085
2086 input_disconnect_device(dev);
2087
2088 mutex_lock(&input_mutex);
2089
2090 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
2091 handle->handler->disconnect(handle);
2092 WARN_ON(!list_empty(&dev->h_list));
2093
2094 del_timer_sync(&dev->timer);
2095 list_del_init(&dev->node);
2096
2097 input_wakeup_procfs_readers();
2098
2099 mutex_unlock(&input_mutex);
2100
2101 device_del(&dev->dev);
2102}
2103
2104static void devm_input_device_unregister(struct device *dev, void *res)
2105{
2106 struct input_devres *devres = res;
2107 struct input_dev *input = devres->input;
2108
2109 dev_dbg(dev, "%s: unregistering device %s\n",
2110 __func__, dev_name(&input->dev));
2111 __input_unregister_device(input);
2112}
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122void input_enable_softrepeat(struct input_dev *dev, int delay, int period)
2123{
2124 dev->timer.function = input_repeat_key;
2125 dev->rep[REP_DELAY] = delay;
2126 dev->rep[REP_PERIOD] = period;
2127}
2128EXPORT_SYMBOL(input_enable_softrepeat);
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153int input_register_device(struct input_dev *dev)
2154{
2155 struct input_devres *devres = NULL;
2156 struct input_handler *handler;
2157 unsigned int packet_size;
2158 const char *path;
2159 int error;
2160
2161 if (test_bit(EV_ABS, dev->evbit) && !dev->absinfo) {
2162 dev_err(&dev->dev,
2163 "Absolute device without dev->absinfo, refusing to register\n");
2164 return -EINVAL;
2165 }
2166
2167 if (dev->devres_managed) {
2168 devres = devres_alloc(devm_input_device_unregister,
2169 sizeof(*devres), GFP_KERNEL);
2170 if (!devres)
2171 return -ENOMEM;
2172
2173 devres->input = dev;
2174 }
2175
2176
2177 __set_bit(EV_SYN, dev->evbit);
2178
2179
2180 __clear_bit(KEY_RESERVED, dev->keybit);
2181
2182
2183 input_cleanse_bitmasks(dev);
2184
2185 packet_size = input_estimate_events_per_packet(dev);
2186 if (dev->hint_events_per_packet < packet_size)
2187 dev->hint_events_per_packet = packet_size;
2188
2189 dev->max_vals = dev->hint_events_per_packet + 2;
2190 dev->vals = kcalloc(dev->max_vals, sizeof(*dev->vals), GFP_KERNEL);
2191 if (!dev->vals) {
2192 error = -ENOMEM;
2193 goto err_devres_free;
2194 }
2195
2196
2197
2198
2199
2200 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD])
2201 input_enable_softrepeat(dev, 250, 33);
2202
2203 if (!dev->getkeycode)
2204 dev->getkeycode = input_default_getkeycode;
2205
2206 if (!dev->setkeycode)
2207 dev->setkeycode = input_default_setkeycode;
2208
2209 if (dev->poller)
2210 input_dev_poller_finalize(dev->poller);
2211
2212 error = device_add(&dev->dev);
2213 if (error)
2214 goto err_free_vals;
2215
2216 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
2217 pr_info("%s as %s\n",
2218 dev->name ? dev->name : "Unspecified device",
2219 path ? path : "N/A");
2220 kfree(path);
2221
2222 error = mutex_lock_interruptible(&input_mutex);
2223 if (error)
2224 goto err_device_del;
2225
2226 list_add_tail(&dev->node, &input_dev_list);
2227
2228 list_for_each_entry(handler, &input_handler_list, node)
2229 input_attach_handler(dev, handler);
2230
2231 input_wakeup_procfs_readers();
2232
2233 mutex_unlock(&input_mutex);
2234
2235 if (dev->devres_managed) {
2236 dev_dbg(dev->dev.parent, "%s: registering %s with devres.\n",
2237 __func__, dev_name(&dev->dev));
2238 devres_add(dev->dev.parent, devres);
2239 }
2240 return 0;
2241
2242err_device_del:
2243 device_del(&dev->dev);
2244err_free_vals:
2245 kfree(dev->vals);
2246 dev->vals = NULL;
2247err_devres_free:
2248 devres_free(devres);
2249 return error;
2250}
2251EXPORT_SYMBOL(input_register_device);
2252
2253
2254
2255
2256
2257
2258
2259
2260void input_unregister_device(struct input_dev *dev)
2261{
2262 if (dev->devres_managed) {
2263 WARN_ON(devres_destroy(dev->dev.parent,
2264 devm_input_device_unregister,
2265 devm_input_device_match,
2266 dev));
2267 __input_unregister_device(dev);
2268
2269
2270
2271
2272 } else {
2273 __input_unregister_device(dev);
2274 input_put_device(dev);
2275 }
2276}
2277EXPORT_SYMBOL(input_unregister_device);
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287int input_register_handler(struct input_handler *handler)
2288{
2289 struct input_dev *dev;
2290 int error;
2291
2292 error = mutex_lock_interruptible(&input_mutex);
2293 if (error)
2294 return error;
2295
2296 INIT_LIST_HEAD(&handler->h_list);
2297
2298 list_add_tail(&handler->node, &input_handler_list);
2299
2300 list_for_each_entry(dev, &input_dev_list, node)
2301 input_attach_handler(dev, handler);
2302
2303 input_wakeup_procfs_readers();
2304
2305 mutex_unlock(&input_mutex);
2306 return 0;
2307}
2308EXPORT_SYMBOL(input_register_handler);
2309
2310
2311
2312
2313
2314
2315
2316
2317void input_unregister_handler(struct input_handler *handler)
2318{
2319 struct input_handle *handle, *next;
2320
2321 mutex_lock(&input_mutex);
2322
2323 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
2324 handler->disconnect(handle);
2325 WARN_ON(!list_empty(&handler->h_list));
2326
2327 list_del_init(&handler->node);
2328
2329 input_wakeup_procfs_readers();
2330
2331 mutex_unlock(&input_mutex);
2332}
2333EXPORT_SYMBOL(input_unregister_handler);
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347int input_handler_for_each_handle(struct input_handler *handler, void *data,
2348 int (*fn)(struct input_handle *, void *))
2349{
2350 struct input_handle *handle;
2351 int retval = 0;
2352
2353 rcu_read_lock();
2354
2355 list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
2356 retval = fn(handle, data);
2357 if (retval)
2358 break;
2359 }
2360
2361 rcu_read_unlock();
2362
2363 return retval;
2364}
2365EXPORT_SYMBOL(input_handler_for_each_handle);
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378int input_register_handle(struct input_handle *handle)
2379{
2380 struct input_handler *handler = handle->handler;
2381 struct input_dev *dev = handle->dev;
2382 int error;
2383
2384
2385
2386
2387
2388 error = mutex_lock_interruptible(&dev->mutex);
2389 if (error)
2390 return error;
2391
2392
2393
2394
2395
2396 if (handler->filter)
2397 list_add_rcu(&handle->d_node, &dev->h_list);
2398 else
2399 list_add_tail_rcu(&handle->d_node, &dev->h_list);
2400
2401 mutex_unlock(&dev->mutex);
2402
2403
2404
2405
2406
2407
2408
2409 list_add_tail_rcu(&handle->h_node, &handler->h_list);
2410
2411 if (handler->start)
2412 handler->start(handle);
2413
2414 return 0;
2415}
2416EXPORT_SYMBOL(input_register_handle);
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428void input_unregister_handle(struct input_handle *handle)
2429{
2430 struct input_dev *dev = handle->dev;
2431
2432 list_del_rcu(&handle->h_node);
2433
2434
2435
2436
2437 mutex_lock(&dev->mutex);
2438 list_del_rcu(&handle->d_node);
2439 mutex_unlock(&dev->mutex);
2440
2441 synchronize_rcu();
2442}
2443EXPORT_SYMBOL(input_unregister_handle);
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456int input_get_new_minor(int legacy_base, unsigned int legacy_num,
2457 bool allow_dynamic)
2458{
2459
2460
2461
2462
2463
2464 if (legacy_base >= 0) {
2465 int minor = ida_simple_get(&input_ida,
2466 legacy_base,
2467 legacy_base + legacy_num,
2468 GFP_KERNEL);
2469 if (minor >= 0 || !allow_dynamic)
2470 return minor;
2471 }
2472
2473 return ida_simple_get(&input_ida,
2474 INPUT_FIRST_DYNAMIC_DEV, INPUT_MAX_CHAR_DEVICES,
2475 GFP_KERNEL);
2476}
2477EXPORT_SYMBOL(input_get_new_minor);
2478
2479
2480
2481
2482
2483
2484
2485
2486void input_free_minor(unsigned int minor)
2487{
2488 ida_simple_remove(&input_ida, minor);
2489}
2490EXPORT_SYMBOL(input_free_minor);
2491
2492static int __init input_init(void)
2493{
2494 int err;
2495
2496 err = class_register(&input_class);
2497 if (err) {
2498 pr_err("unable to register input_dev class\n");
2499 return err;
2500 }
2501
2502 err = input_proc_init();
2503 if (err)
2504 goto fail1;
2505
2506 err = register_chrdev_region(MKDEV(INPUT_MAJOR, 0),
2507 INPUT_MAX_CHAR_DEVICES, "input");
2508 if (err) {
2509 pr_err("unable to register char major %d", INPUT_MAJOR);
2510 goto fail2;
2511 }
2512
2513 return 0;
2514
2515 fail2: input_proc_exit();
2516 fail1: class_unregister(&input_class);
2517 return err;
2518}
2519
2520static void __exit input_exit(void)
2521{
2522 input_proc_exit();
2523 unregister_chrdev_region(MKDEV(INPUT_MAJOR, 0),
2524 INPUT_MAX_CHAR_DEVICES);
2525 class_unregister(&input_class);
2526}
2527
2528subsys_initcall(input_init);
2529module_exit(input_exit);
2530